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M9640703.TXT
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1996-03-04
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Document 0703
DOCN M9640703
TI Strenuous exercise and immunological changes: a multiple-time-point
analysis of leukocyte subsets, CD4/CD8 ratio, immunoglobulin production
and NK cell response.
DT 9604
AU Shek PN; Sabiston BH; Buguet A; Radomski MW; Defence and Civil Institute
of Environmental Medicine, North; York, Ontario, Canada.
SO Int J Sports Med. 1995 Oct;16(7):466-74. Unique Identifier : AIDSLINE
MED/96128797
AB This study was designed to examine the impact of exhaustive endurance
exercise on a number of immune parameters of physically fit male
subjects (VO2max 66.5 +/- 5.3 ml/min/kg) who performed treadmill
exercise at 65% of their VO2max for 120 min. Serial blood samples were
taken before, during and after exercise and changes in leukocyte and
lymphocyte subset concentrations; immunoglobulin production in vitro;
and natural killer (NK) cell response were measured. The exercise
regimen was found to induce the well-known phenomenon of leukocytosis
which consisted primarily of a granulocytosis and lymphocytosis. Among
the lymphocyte subsets, peripheral pan T cells (CD3+) as well as helper
(CD4+) and suppressor (CD8+) T cells were found to be elevated. A
relatively smaller increase in CD4+ than CD8+ cells resulted in
depressed CD4/CD8 ratios throughout the exercise period. After exercise,
T cells declined progressively and, 2 h post-exercise, were less than
60% of their pre-exercise level. In contrast, the CD4/CD8 ratio
demonstrated a progressive increase, thus representing a reversal in the
pattern observed during exercise and a trend towards an elevated ratio
during recovery. B cells (CD19+) were relatively unaffected by exercise,
although IgM production by pokeweed mitogen-stimulated lymphocytes
obtained from blood samples after 120 min of exercise was significantly
depressed. NK cells were affected dramatically by exercise. Both CD16+
cell numbers and NK cytotoxicity were increased during exercise,
followed by a persistent depression in the post-exercise period. The
strenuous exercise induced profound effect on NK cells as evidenced by a
40% depression of the NK cell count for as long as 7 days after the
cessation of exercise. Our results provide direct kinetic evidence
demonstrating that exhaustive exertion alters both lymphocyte
distribution pattern and effector function, suggestive of possible
exercise-induced immune compromise, particularly in the post-exercise
recovery period.
DE Adult *CD4-CD8 Ratio Exertion/*PHYSIOLOGY Human
Immunoglobulins/*METABOLISM Killer Cells, Natural/*IMMUNOLOGY
Leukocyte Count Lymphocyte Count *Lymphocyte Subsets Male Support,
Non-U.S. Gov't JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).